Fume hood for laboratory tables



Oct. 25, 1932. E. H. SHELDON- FUME HOOD FOR LABORATORY TABLES 5Shets-Sheet 1 Filed Sept. 2, 1924 5, 1932- E. H. SHELDON FUME HOOD FORLABORATORY TABLES Filed Sept. 2, 1924 5 Sheets-Sheet 2-imiliiiwliiiiii-1111} rii|ll$ Oct. 25, 1932. E. H. SHELDON FUME HOODFOR LABORATORY TABLES 5 Sheets-Sheet 3 Filed Sept. 2, 1924 iwerr/z n 7-Patented Oct. 25, 1932 I UNITEDfS A PATENT OFFICE E GAR H summon,OFMUSKEGON, MICHIGAN FUVME noon FOR LABORATORY TABLES Application filedSeptember 2, 1924. Serial No. 735,226.

. My inventionc relates to fume hoods for laboratory tables.

, One of the objects of athe inventioni is to Fig. 2 is a plan view ofthe same with parts broken away for convenience of lllustration Fig. 3is an end elevation of the same with parts broken away; and

in Fig. 3. Referring to the drawings, I show a portion of a table top 1understood to be the'top of a laboratory table or other device which isto be provided with a fume hood.

Mounted on the table 1 is the fume hood comprising end uprights 2 and 3,and a top or cover 4 mounted on and extending becomprises a supportingmember or portion 5 conveniently constructed of end members 5a5a andside members 5b,5b, connected- This top sup I with the end members 5a5a.porting member 5 is made hollow or tubular and is intended to receivethe fumes rising from the table and the supporting standards or posts 2and 3 are also hollow or tubular and are intended to receive the fumesfrom the member 5-and conduct the same downwardly and away in anydesired manner, as for example, through pipes 88 extending down l fromthe under Slde of the mile the latter be having fume ducts communicatingwith the ing provided with apertures 9-9 affording and pipes 88.

To permit fumes to enter the member 5 the in the lower Walls of the,sides 5b-5b, and to broken away for convenience of illustration;

they may be removed to provide openings on the inner sides of theuprights 2 and 3-at the points therein just above the table top 1.

Fig. 4 is a cross section taken on line 4r4:

tween the uprights 2 and 3. The top t communication between standards 2and 3 permit control of the fumes entering these slots" andtheconcentration of thefumes as desired, dampers 1212 are provided havingcontrolling handles 14-14, whereby: the slides 12-12 may be movedlengthwise of the -jci members 5?) to close diiferentportions of theseslots l111., L r c A table top plate 15 is. provided, the same beingsecured at its edges to the member 5 V and covering the space formed bysaid mom-Hi her 5. This prevents fumes from escaping through the areawithin the sides and ends of the member 5' and causes them to moveoutwardlyand enter the slots 11'11, to which slots the fumes are drawnby suctionapplied to the pipes 88. Y L

, To take care of heavy fumes near the table top, dampers I 17-17 areprovided, said dampers having handles 1818 by which From the foregoingit will :be seen that a highly eflicient fume hood construction isprovidedin which themovement of the fumes 75 may be readily controlledby dampers. It

willalso, be seen that the construction creates 1 air suction currentsatmore nearly the points at which the fumes" are created, and that lesssuction is required to accomplish fume elimi-s,;

nation. Also' that the shape of the ducts is such as to offer lessresistance to the air currents a's they pass down through the ducts.

It will be understood that changes and modifications may be made withoutdeparting from the spirit of the invention.

WhatI claim is:' f 1.,A fume hood having a hollow membereite'ndingaround its outer edge and provided with fume inlet openings,and uprights at the outer edges of'said fume hood on which said hollowmember is mounted, said uprights interior of said hollow member.

2., A. fume hood comprising hollow uprights and a top structure mountedthereon,

said structure being provided with marginal fume inlets and also withducts communicating with said inlets and also with said hollow uprights,and means controlling the entrance of fumes into said marginal inlets.

3. A fume hood comprising hollow uprights and a top structure mountedthereon, said structure being provided with marginal fume inlets andalso with ducts communicating with said inlets and also with said hollowuprights, and means controlling the entrance of fumes'into said marginalinlets, said controlling means comprising sliding dampers.

4. A fume hood comprising hollow uprights and a top structure mountedthereon, said structure being provided with marginal fume inlets andalso with ducts communicating with. said inlets and also with saidhollow uprights, and means controlling the entrance of fumes into saidmarginal inlets,

said uprights being provided with means at their lower ends forpermitting heavy fumes to enter said uprights.

5. A fume hood comprising hollow uprights and a top structure mountedthereon,

said structure being provided with marginal fume inlets and also withducts communicating with said inlets and also with said hollow ortubular uprights, and means controlling the entrance of fumes into saidmarginal inlets, said uprights being provided with means at their lowerends for permitting heavy fumes to enter said uprights, and means forcontrolling said last mentioned inlet means.

6. A fume hood comprising hollow uprights and a top member mountedthereon, said top member consisting of an endless tubular member and atop plate extending across and secured to said tubular member so as to cover the space enclosed by the same, said tubular member being providedwith longitudinally extending fume inlet openings and being mounted uponsaid hollow uprights at points between said longitudinally extendingopenings, the portions of said tubular member mounted on said hollowuprights communicating with the interior thereof.

7 A fume hood comprising hollow uprights having flaring'upper ends, atop member mounted onsaid uprights, said top memprovided with fumeinlets and whose ends communicate with said uprights so as to conveyfumes from said inlets to said uprights, and dampers controlling saidfume inlets, said uprights being provided with damper controlled inletsnear their lower ends.

9. A device of the class specified compris ing a substantially flat fumegathering struc ture composed of a substantially rectangular E endlesstubular member and a flat plate member supported by and seeuredto saidtubular member and eXtending-acrossthe space enclosed by the same, saidtubular member having. its sides provided with longitudinally extendingfume inlets and its ends provided with fume outlets and supportingmembers for said tubular member supporting the ends ofisaid tubularmember and provided with ducts communicating with the {)ume outlets inthe ends of said tubular mem- 10, A-fu-mehood havinga downwardlyextending marginal rim having its bottom pro vided with fume inlets.

11. A fume hood provided with-elevated fume inlets forthe gases lighterthan air and with relatively low inlets forgases heavier than air.

In witness whereof, I hereunto subscribe

